In my heart of hearts

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The Bard was a logical man, and he went about coining sensible
phrases in a rational fashion. Thus, Hamlet does not say "in my
heart of hearts," but "in my heart of heart"—that is, at the
"heart" (center) of my heart. The phrase is in fact a synonym for
"In my heart's core." And like the heart of an artichoke, the heart
of Hamlet's heart is its most tender part. He reserves this region
of his affection for men who aren't slaves to their passion, who
are governed by reason, like his friend Horatio (whom he addresses
here) and, indeed, like the phrase-coining Shakespeare.

We've perverted the phrase into "in my heart of hearts" by way
of expressions like Ecclesiastes' "vanity of vanities." But where
Ecclesiastes had a number of vanities from which to elect a chief
or encompassing vanity—presumption—one doesn't have a number of
hearts. Even granting that we use "heart" mostly as a metaphor and
not with reference to the organ, we never mean to speak of having
more than one.